How to use
- Enter the inputs.
- Sanity-check the outputs.
- Use the result as a planning anchor, not a promise.
Jump to
Tool
Inputs → outputs
This page is intentionally practical: get numbers first, then read the how-to.
Inputs
- • Distance (km/mi)
- • Cutoff time (hh:mm)
- • Planned pace (sec per unit) (optional)
Outputs
- • Required average pace
- • Planned finish time
- • Buffer vs cutoff
Export
Print or share the tool
Useful outputs beat generic SEO copy. Print a PDF or share this page before race week.
Tip: print or save as PDF for race week.
Example presets
Prefill with a realistic scenario
Pick an example to prefill the calculator, then tweak inputs for your own training week.
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Quick answers
The 60-second version
Snippet-ready answers to common questions. Use the calculator above for the numbers.
Why do I need extra margin?
Ultras include aid-station time, terrain slowdowns, and fatigue drift. A cutoff is a hard line; planning margin is the safe move.
Should I pace by mile/km splits?
Usually not. Pace by effort and terrain, then use cutoffs as checkpoints rather than rigid split targets.
What’s the best way to avoid missing cutoffs?
Start conservatively, keep moving through stations, and avoid big spikes in effort early that cause late crashes.
Assumptions
What this tool assumes
- • You can translate average pace into on-course execution (terrain can break this).
- • Aid-station time is not included — add margin.
Limitations
What can break it
- • Does not account for elevation gain/loss, technical trails, heat, or mandatory gear transitions.
- • Cutoffs are often per-segment; you should verify segment rules and plan accordingly.
Related
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FAQs
Why do I need extra margin?
Ultras include aid-station time, terrain slowdowns, and fatigue drift. A cutoff is a hard line; planning margin is the safe move.
Should I pace by mile/km splits?
Usually not. Pace by effort and terrain, then use cutoffs as checkpoints rather than rigid split targets.
What’s the best way to avoid missing cutoffs?
Start conservatively, keep moving through stations, and avoid big spikes in effort early that cause late crashes.
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